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      Exceutor
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        <h5 id="Executor"><a href="#Executor" class="headerlink" title="Executor"></a>Executor</h5><p>Java通过Executors提供四种线程池，分别为：</p>
<ul>
<li>newCachedThreadPool创建一个可缓存线程池，如果线程池长度超过处理需要，可灵活回收空闲线程，若无可回收，则新建线程。</li>
<li>newFixedThreadPool 创建一个定长线程池，可控制线程最大并发数，超出的线程会在队列中等待。</li>
<li>newScheduledThreadPool 创建一个定长线程池，支持定时及周期性任务执行。</li>
<li>newSingleThreadExecutor 创建一个单线程化的线程池，它只会用唯一的工作线程来执行任务，保证所有任务按照指定顺序(FIFO, LIFO, 优先级)执行。</li>
</ul>
<p>###### </p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> javacc.executor;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Auther</span>: chenv</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span>: 2018/11/5 09:47</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>:</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Threadv</span> <span class="keyword">implements</span> <span class="title">Runnable</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> Integer index;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">Threadv</span><span class="params">(Integer index)</span></span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.index=index;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        System.out.println(<span class="string">"执行业务。。。。。。"</span>);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span>&#123;</span><br><span class="line">            System.out.println(<span class="string">"开始执行线程。。。"</span>);</span><br><span class="line">            Thread.sleep(index*<span class="number">100</span>);</span><br><span class="line">            System.out.println(<span class="string">"我的线程数是： "</span>+<span class="keyword">this</span>.toString() +<span class="string">" index :"</span>+index);</span><br><span class="line">        &#125;<span class="keyword">catch</span> (Exception e)&#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h6 id="newCachedThreadPool"><a href="#newCachedThreadPool" class="headerlink" title="newCachedThreadPool"></a>newCachedThreadPool</h6><p>创建一个可缓存线程池，应用中存在的线程数可以无限大</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *  可缓存线程池，应用中存在的线程数可以无限大</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line">ExecutorService newCachedThreadPool = Executors.newCachedThreadPool();</span><br><span class="line">System.out.println(<span class="string">"********************newCachedThreadPool********************"</span>);</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; <span class="number">10</span>; i++) &#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">final</span> <span class="keyword">int</span> index = i;</span><br><span class="line">    newCachedThreadPool.execute(<span class="keyword">new</span> Threadv(index));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>输出：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">********************newCachedThreadPool********************</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">1478</span>a613 index :<span class="number">0</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">42</span>ab3a06 index :<span class="number">1</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">51e03</span>dd8 index :<span class="number">2</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">4e3058f</span>8 index :<span class="number">3</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">76f</span>e9cc2 index :<span class="number">4</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">1f</span>7a85de index :<span class="number">5</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">1</span>aff604b index :<span class="number">6</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">495</span>beecb index :<span class="number">7</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">77767</span>c58 index :<span class="number">8</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">5259e47</span>e index :<span class="number">9</span></span><br></pre></td></tr></table></figure></p>
<h6 id="newFixedThreadPool"><a href="#newFixedThreadPool" class="headerlink" title="newFixedThreadPool"></a>newFixedThreadPool</h6><p>创建一个定长线程池，可控制线程最大并发数，超出的线程会在队列中等待。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 定长线程池，可控制线程最大并发数，超出的线程会在队列中等待</span></span><br><span class="line"><span class="comment">//线程池允许同时存在两个线程</span></span><br><span class="line">ExecutorService newFixedThreadPool = Executors.newFixedThreadPool(<span class="number">2</span>);</span><br><span class="line">System.out.println(<span class="string">"****************************newFixedThreadPool*******************************"</span>);</span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;<span class="number">10</span>;i++)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">final</span> <span class="keyword">int</span> index=i;</span><br><span class="line">    newFixedThreadPool.execute(<span class="keyword">new</span> Threadv(index));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>输出 ：</p>
<p>每次只有俩个线程存在<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">****************************newFixedThreadPool*******************************</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">4f</span>044f6c index :<span class="number">0</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">4</span>bb881c1 index :<span class="number">1</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">41</span>c3a8fc index :<span class="number">2</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">457f</span>66c6 index :<span class="number">3</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">45f</span>c241c index :<span class="number">4</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">4140</span>eab1 index :<span class="number">5</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv<span class="meta">@fea</span>2c7 index :<span class="number">6</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">4426</span>cfd index :<span class="number">7</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">6</span>d6cf29b index :<span class="number">8</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv<span class="meta">@bfb</span>533d index :<span class="number">9</span></span><br></pre></td></tr></table></figure></p>
<h6 id="newScheduledThreadPool"><a href="#newScheduledThreadPool" class="headerlink" title="newScheduledThreadPool"></a>newScheduledThreadPool</h6><p>创建一个定长线程池，支持定时及周期性任务执行</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 定长线程池，支持定时及周期性任务执行</span></span><br><span class="line">ScheduledExecutorService newScheduledThreadPool = Executors.newScheduledThreadPool(<span class="number">2</span>);</span><br><span class="line">System.out.println(<span class="string">"****************************newScheduledThreadPool*******************************"</span>);</span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;<span class="number">10</span>;i++)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">final</span> <span class="keyword">int</span> index=i;</span><br><span class="line">    <span class="comment">//延迟三秒执行</span></span><br><span class="line">    newScheduledThreadPool.schedule(<span class="keyword">new</span> Threadv(index),<span class="number">3</span>, TimeUnit.SECONDS);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>输出 ：</p>
<p>==延迟三秒之后执行，除了延迟执行之外和newFixedThreadPool基本相同，可以用来执行定时任务==<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">****************************newScheduledThreadPool*******************************</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">52</span>a91127 index :<span class="number">0</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">56969f</span>aa index :<span class="number">1</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">6</span>c7d6e81 index :<span class="number">2</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">13941</span>b1c index :<span class="number">3</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">62</span>ba8d7e index :<span class="number">4</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">38f</span>7f590 index :<span class="number">5</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">668505f</span>1 index :<span class="number">6</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">22</span>cdeb80 index :<span class="number">7</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">23878745</span> index :<span class="number">8</span></span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">40445</span>bbc index :<span class="number">9</span></span><br></pre></td></tr></table></figure></p>
<h6 id="newSingleThreadExecutor"><a href="#newSingleThreadExecutor" class="headerlink" title="newSingleThreadExecutor"></a>newSingleThreadExecutor</h6><p>创建一个单线程化的线程池，它只会用唯一的工作线程来执行任务，保证所有任务按照指定顺序(FIFO, LIFO, 优先级)执行<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//单线程化的线程池，它只会用唯一的工作线程来执行任务，保证所有任务按照指定顺序(FIFO, LIFO, 优先级)执行</span></span><br><span class="line"></span><br><span class="line"> ExecutorService newSingleThreadExecutor = Executors.newSingleThreadExecutor();</span><br><span class="line"> System.out.println(<span class="string">"****************************newSingleThreadExecutor*******************************"</span>);</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;<span class="number">10</span>;i++)</span><br><span class="line"> &#123;</span><br><span class="line">     <span class="keyword">final</span> <span class="keyword">int</span> index=i;</span><br><span class="line">     newSingleThreadExecutor.execute(<span class="keyword">new</span> Threadv(index));</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure></p>
<p>输出 ：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">****************************newSingleThreadExecutor*******************************</span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">342648</span>c8 index :<span class="number">0</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">3</span>ae1a03c index :<span class="number">1</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">3</span>ede23b8 index :<span class="number">2</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">7</span>bdcaa07 index :<span class="number">3</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">7</span>d3acdbc index :<span class="number">4</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">4</span>aed7267 index :<span class="number">5</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">5e14</span>b61 index :<span class="number">6</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">1</span>bf35548 index :<span class="number">7</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">308f</span>3ca7 index :<span class="number">8</span></span><br><span class="line">执行业务。。。。。。</span><br><span class="line">开始执行线程。。。</span><br><span class="line">我的线程数是： javacc.executor.Threadv@<span class="number">11501e9</span>b index :<span class="number">9</span></span><br></pre></td></tr></table></figure></p>

      
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